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Preparation of novel catalytic materials in the Fischer-Tropsch synthesis

Author: YuGuoBin
Tutor: QiaoMingHua
School: Fudan University
Course: Physical and chemical
Keywords: Fischer-Tropsch synthesis iron catalyst cerium modification capsule type catalyst pudding type catalyst
CLC: TQ529.2
Type: Master's thesis
Year: 2009
Downloads: 185
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Abstract


Fischer-Tropsch synthesis is a method to produce ultra clear liquid fuel by catalytical reaction from syngas, which is very important to deal with the recent oil crisis and environment protection. The key of the process is to develop catalysts, which are highly efficient, easy to handle, and inexpensive .This paper studied the iron-based Fischer-Tropsch synthesis catalyst. In the first section, we studied the Raney Fe catalyst and the RQ（ripidly quenched） Fe catalyst, and the effects of reaction condition on the catalysts. We found that the high temperature and pressue is beneficial to the activity, while low temperature and high pressure is good for C5+ selectivity. The RQ Fe catalyst displays better stability and higher CO conversion than the Raney Fe catalyst, while the C5+ selectivity on the Raney Fe catalyst is better than the RQ Fe catalyst.In the second section, we studied the effect of the cerium promoter on the RQ Fe catalyst. It is found that cerium promoter could enter into the iron skeletal to produce more active site and transfer electron to the iron atom. Thus, the cerium promoted iron catalysts exhibit better Fischer-Tropsch synthesis stability, olefin selectivity and C5+ selectivity （from 19.9 to 33.5%）.In the third section, we prepared a capule type RQ Fe-HZSM-5 catalyst and tested in the Fischer-Tropsch synthesis. The capsule-type RQ Fe-HZSM-5 catalyst exhibits better activity （from 61.2% CO conversion on RQ Fe to 79.6% on the RQ Fe-HZSM-5）, and the C5+ selectivity of the RQ Fe-HZSM-5 catalyst is about three times more than the RQ Fe catalyst.In the fourth section, we demonstrated a one-pot hydrothermal co-hydrolysis-carbonization process using glucose and iron nitrate as starting materials for the fabrication of carbonaceous spheres embedded with iron oxide nanoparticles. We tested the catalyst in Fischer-Tropsch synthesis. It is found that the C5+ selectivity is the highest in the unmodified iron-based catalyst according to the report and the C5-12 selectivity reaches 40%, which is also the best in the literature report.

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